| Band Description | Band Name | Note |
| Rivers Cuomo's childhood KISS cover band | |
| Cuomo's Connecticut-based metal band | |
| Cuomo and Pat Wilson's first pre-Weezer collaboration | |
| Cuomo, Wilson, Jason Cropper and Pat Finn's pre-Weezer band | |
| Just prior to joining Weezer, Brian Bell quit this band | |
| Wilson's first side band of the Weezer era | |
| Matt Sharp's synth-driven rock band | |
| Cropper's main post-Weezer band | |
| Bell's first side band after joining Weezer | |
| | Band Description | Band Name | Note |
| Wilson and Karl Koch's one-off collaboration | |
| Wilson's primary side band | |
| Cuomo's Boston-based, post-Pinkerton group, which played potential new Weezer material | |
| Cuomo's 'goofy, country' project, which officially released one track | |
| Weezer's alias band, originally created to play Nirvana and Oasis covers | |
| Welsh's lone post-Weezer band | |
| Wilson's electronic side project | |
| Bell's second side band | |
|